Élimination des composés pharmaceutiques en station d’épuration par traitements biologiques et ozonation tertiaire

Abstract : The choice to operate the CAS and MBBR systems with full nitrification, results in the same level of performance on pharmaceutical compounds removal for both biological systems (despite the differences on process conditions : sludge concentration, hydraulic contact time…). The biological treatment of 10 pharmaceuticals with CAS or MBBR reactor succeeded in 24% of removal of the 7 refractory compounds measured (carbamazepine, sulfamethoxazole, propranolol, atenolol, diclofenac, econazole, salicylic acid), and an average of 45% including also paracetamol, ketoprofen and ibuprofen with an important variability on performances (> 20%). The combined system CAS biolog ical treatment plus tertiary ozonation at low ozone dosage (0.45 gO3/gDOC) improves the average removal up to 92% with only one compound -econaz ole- moderately eliminated (70%). It has been observed that increasing the ozone from the low to the intermediate dosage of 1.30 gO3/gDOC leads to an average removal improvement of around 6% whereas a more important TOD (2.30 gO3/gDOC) did not led to a better performance. Contrary to the lack of toxicity observed with normalized ecotoxicity tests, endpoints measured on zebrafish embryos (FET bioassay) such as mortality, developmental abnormalities and genotoxicity demonstrated a residual toxicity (null/weak) both, in wastewater after a biological treatment followed or not by a tertiary ozonation treatment. However, the tertiary ozonation resulted in an improvement of the residual endocrine disrupting potential measured in the biologically-treated effluents. This study shows that normalized bioassays are not sensitive enough for the ecotoxicological evaluation of wastewaters and that there is a great need for the development of suitable sensitive bioassays in order to characterize properly the possible residual toxicity of differently treated effluents. The knowledge of the sample chemical fingerprints, by a comprehensive non-target approach based on the comparison of biochemical signatures, is a promising growing strategy to identify and prioritize the emerging contaminants and to contribute to the study of the treatment performance.
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Submitted on : Tuesday, August 23, 2016 - 4:12:17 PM
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Adriana Gonzalez-Ospina, Bruno Domenjoud, Emmanuelle Vulliet, Agneta Kiss, Alexandre Bergé, et al.. Élimination des composés pharmaceutiques en station d’épuration par traitements biologiques et ozonation tertiaire. Techniques Sciences Méthodes , ASTEE/EDP Sciences, 2016, pp.45-58. ⟨10.1051/tsm/201606045 ⟩. ⟨hal-01355571⟩



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